Today Amazon unveiled the battery-powered Echo Input Portable Smart Speaker Edition (yes, that's the official name). It's designed specifically for India, though it will expand to other markets eventually. What sets it apart from almost every other Echo speaker is that it packs a 4,800mAh battery, which allows it to play 10 hours of music without being plugged into the wall. This lets you move it around the house, even to places where there isn't a convenient power plug. Unlike the ill-fated Echo Tap from 2016, the Input Portable can be controlled with the usual "Alexa" hot word (the...